diff --git a/include/etl/version.h b/include/etl/version.h
index 1939f2b5..4fff58f9 100644
--- a/include/etl/version.h
+++ b/include/etl/version.h
@@ -39,7 +39,7 @@ SOFTWARE.
 
 #define ETL_VERSION_MAJOR 20
 #define ETL_VERSION_MINOR 11
-#define ETL_VERSION_PATCH  2
+#define ETL_VERSION_PATCH  3
 #define ETL_VERSION       ETL_STRINGIFY(ETL_VERSION_MAJOR) "." ETL_STRINGIFY(ETL_VERSION_MINOR) "." ETL_STRINGIFY(ETL_VERSION_PATCH)
 #define ETL_VERSION_W     ETL_STRINGIFY(ETL_VERSION_MAJOR) L"." ETL_STRINGIFY(ETL_VERSION_MINOR) L"." ETL_STRINGIFY(ETL_VERSION_PATCH)
 #define ETL_VERSION_U16   ETL_STRINGIFY(ETL_VERSION_MAJOR) u"." ETL_STRINGIFY(ETL_VERSION_MINOR) u"." ETL_STRINGIFY(ETL_VERSION_PATCH)
diff --git a/library.json b/library.json
index 200b4de9..fbb62211 100644
--- a/library.json
+++ b/library.json
@@ -1,6 +1,6 @@
 {
   "name": "ETL Embedded Template Library",
-  "version": "20.11.2",
+  "version": "20.11.3",
   "author s": {
     "name": "John Wellbelove",
     "email": "john.wellbelove@etlcpp.com"
diff --git a/library.properties b/library.properties
index 0780c918..735cec9a 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=Embedded Template Library ETL
-version=20.11.2
+version=20.11.3
 author= John Wellbelove <john.wellbelove@etlcpp.com>
 maintainer=John Wellbelove <john.wellbelove@etlcpp.com>
 license=MIT
diff --git a/meson.build b/meson.build
index 8355fa88..cdd8ac7d 100644
--- a/meson.build
+++ b/meson.build
@@ -8,7 +8,7 @@ project('PROJECT_NAME',
 		'cpp_std=c++17', 'build.cpp_std=c++17',
 	],
 	meson_version: '>=0.54.0',
-	version: '20.11.2'
+	version: '20.11.3'
 )
 
 ######################
diff --git a/support/Release notes.txt b/support/Release notes.txt
index 6cab183b..3100f572 100644
--- a/support/Release notes.txt	
+++ b/support/Release notes.txt	
@@ -1,3 +1,7 @@
+===============================================================================
+20.11.3
+Define missing macro when cross compiling with clang for AVR
+
 ===============================================================================
 20.11.2
 etl::basic_string::copy is now const and does not affect truncation flags.